Mix the softened cream cheese, powdered sugar, and vanilla extract in a bowl until smooth.
Fold in the mixed berries into the cream cheese mixture.
Spread the cream cheese mixture on two slices of bread and top with the remaining slices.
Whisk together the eggs, milk, and cinnamon in a bowl.
Heat a skillet over medium heat and add butter.
Dip each sandwich into the egg mixture, coating both sides.
Place the sandwiches in the skillet and cook for 3-4 minutes per side until golden brown.
Remove from skillet and let cool slightly.
Serve warm with maple syrup and additional berries on top.